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    <title>Document</title>
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    <script>
        let obj = {
            name: '曾鹏',
            age: 18
        }
        for (const key in obj) {
            //key是对象的属性名
            console.log(key);
            //obj[key]是对象中每一项的值
            console.log(obj[key]);
        }

    </script>
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